772 



CONVOLVULACEAE 



Cuscuta 



50 



Map 1662 



Cuscuta compacts Juss. 



50 



Map 1663 



Cuscuta pentagons Engelm. 



Map 1664 

 Cuscuta campestris Yuncker 



Flowers commonly 4-parted (or 3-parted). 



Withered corolla remaining more or less persistent as a cap at the apex of the 



capsule ; inf rastaminal scales well developed 7. C. Cephalanthi. 



Withered corolla remaining at the base of the capsule, around it or early 

 deciduous; inf rastaminal scales rudimentary. 

 Flowers fleshy, papillate, about 2 mm long; on pedicels longer or shorter than 



the flowers; calyx lobes acute; corolla lobes with inflexed tips 



8. C. Coryll 



Flowers glabrous, about 2-2.5 mm long, subsessile; calyx lobes obtuse; corolla 

 lobes without inflexed tips 9. C. Polygonorum. 



1. Cuscuta cuspidata Engelm. Cuspidate Dodder. Map 1660. My only 

 specimens are from Posey County. Yuncker reported it from Vigo 

 County (Proc. Indiana Acad. Sci. 1920 : 229. 1921.) This is a southwestern 

 species. 



Hosts: Prefers species of Compositae; specimens reported are on 

 Ambrosia. 



Ind., Colo., Utah, southw. to La. and Tex. 



2. Cuscuta glomerata Choisy. Glomerate Dodder. Map 1661. On 

 hosts of low ground, mostly in marshes. 



Hosts of my specimens are: 1 on Apios, 1 on Asclepias syriaca, 3 on 

 Aster, 4 on Helianthus, and 1 on Solidago. 



Mich, and Ind. to S. Dak. and Nebr., southw. to Miss, and Tex. 



3. Cuscuta compacta Juss. Compact Dodder. Map 1662. On hosts 

 mostly of low ground. Hosts of my species are as follows; 3 on Campsis 

 radicanSy 5 on Cephalanthus occidentalis, 2 on Rhus radicans; 1 on Salix, 

 2 on Sassafras albidum, and 1 on Vitis cinerea. 



N. H. to Okla., southw. to Fla., and Tex. 



4. Cuscuta pentagona Engelm. (Cuscuta arvensis Bey rich.) Field 

 Dodder. Map 1663. This is our common field dodder and must be 

 regarded as an obnoxious weed. It is commonly found on clover. 



